That actually would be pretty sweet. I'd like a few more switches in the car and wiring them separately might be a little easier.
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Here's a pic of the switch I bought to control my headlight LEDs to give you an idea:
http://i663.photobucket.com/albums/u...g/DSC02460.jpg
I bought it at Radioshack, they had 3-4 drawers full of switches. This one has a blue light around the bottom of the switch. I'm sure you'll find something to your liking. Good luck with whatever you go with. I'm waiting to see if I need a separate power source for my headlight LEDs or if the power used for the blue light in the switch will also power up the LEDs.
http://www.aveoforum.com/forum/f83/c...dlights-11977/ Mine aren't halos but the guy who did mine could easily do a halo setup for you.